Size-dependent polymer/CuInS₂ solar cells with tunable synthesis of CuInS₂ quantum dots

详细信息    查看全文

• 作者：Wenjin Yue ; ^{yuewenjin_79@163.com" class="auth_mail} ; Mingyang Lan ; Guoqiang Zhang ; Wenshan Sun ; Songming Wang ; Guangjun Nie ; ^{join-us@163.com" class="auth_mail}
• 关键词：CuInS2 ; Quantum dots ; Solvothermal process ; Solar cells ; Charge transfer
• 刊名：Materials Science in Semiconductor Processing
• 出版年：August 2014
• 年：2014
• 卷：24
• 期：Complete
• 页码：117-125
• 全文大小：3924 K

文摘

This paper reports the size-dependent performance in polymer/CuInS₂ solar cells with tunable synthesis of chalcopyrite CuInS₂ quantum dots (QDs) by the solvothermal method. The CuInS₂ QDs of 3.2–5.4 nm in size are fine tuned by the reaction time in the solvothermal process with the slow supply of In³⁺ ions during the crystallization, and the band gaps increased with QDs sizes decreasing according to the results from the characterization of sizes, morphologies, component elements, valence states and band gaps of CuInS₂ QDs. We fabricated MEH-PPV/CuInS₂ solar cells, and the photoactive layer of device displayed size-dependent light-harvesting, charge separation and transport ability. Moreover, the solar cells exhibit size-dependent short circuit current (J_sc) and open circuit voltage (V_oc), with higher performance in both J_sc and V_oc for smaller CuInS₂ QDs, resulting in the maximum power conversion efficiency of ca. 0.12% under the monochromic illumination at 470 nm; CuInS₂ QDs actually serve as an effective electron acceptor material for the MEH-PPV/CuInS₂ solar cells with the wide spectral response extending from 300 to 900 nm.